JP5830332B2 - Label, adhesive label and printed matter - Google Patents

Description

  The present invention relates to a label that can be used for preventing forgery, for example, and an adhesive label and printed matter including the label.

  In recent years, the distribution of counterfeit products has become a major social problem. Therefore, for example, a label may be attached to an article so that it can be confirmed that the article is genuine. Such a label, so-called anti-counterfeit label, is formed by a special printing such as a label including a printing layer formed by a functional ink such as fluorescent ink and OVI (optically variable ink), micro printing and intaglio printing, for example. There are labels including printed layers, labels including holograms or diffraction gratings, labels written with information by magnetic recording, and labels including IC (integrated circuit) tags.

  Many of these anti-counterfeit labels are difficult to counterfeit themselves. However, some anti-counterfeit labels can be peeled off relatively easily from the article on which they are attached. Such labels can be used for fraudulent activities such as peeling off used articles and attaching them to counterfeit goods.

  Some forgery prevention labels have taken measures to make their reuse impossible.

  For example, some forgery prevention labels are provided with notches. Such an anti-counterfeit label is designed to tear from the position of the notch when it is peeled off from the article to which it is applied.

  There are also anti-counterfeit labels in which the base material causes brittle fracture with a relatively small force. Such labels are also designed so that they will be destroyed if they are to be peeled off from the article to which they are applied.

  Further, there is a forgery prevention label that includes a brittle layer that causes brittle fracture with a relatively small force, and the adhesive strength between the brittle layer and a layer adjacent to the surface on the viewer side varies depending on the place. When such a label is peeled off from the article to which it is attached, the brittle layer is broken in a pattern corresponding to the adhesive strength distribution. As a result, for example, a part of the brittle layer or the like remains on the article in a pattern corresponding to the character string “VOID”, and a brittle layer or the like of the anti-counterfeit label has a missing part of the pattern corresponding to the character string “VOID”. Arise.

  These anti-counterfeit labels are not reusable or difficult when peeled off from the article by peeling off. However, these anti-counterfeit labels may be peeled without damaging the label body when an organic solvent is soaked into the adhesive layer or the adhesive layer.

Some anti-counterfeit labels employ techniques to make this impossible or difficult.
For example, there is an anti-counterfeit label using a mixture of a pressure-sensitive adhesive and a hardly soluble additive as a material for the pressure-sensitive adhesive layer (see, for example, Patent Document 1). When this anti-counterfeit label is peeled off using an organic solvent, the surface of the pressure-sensitive adhesive layer is uneven due to the difference in solubility of the pressure-sensitive adhesive and the additive to the organic solvent.

  There is also a forgery prevention label whose printing layer contains a dye soluble in an organic solvent (see, for example, Patent Document 2). When the anti-counterfeit label is to be peeled off using an organic solvent, the dye oozes from the printed layer.

  In addition, this label can be peeled without damaging the label main body or bleeding of the dye by warming the surface with a dryer or the like. An example of the anti-counterfeit label taking measures against peeling by heating is, for example, an anti-counterfeit label in which foamed particles that are foamed by heating are contained in an adhesive layer (see, for example, Patent Document 3).

  These anti-counterfeit labels cannot be reused or are difficult when peeled off using an organic solvent or heat. However, for articles that have expired, the possibility that the anti-counterfeit label is removed together with the surface layer of the article to which it has been applied must be considered. The measures described above cannot prevent the reuse of the anti-counterfeit label thus removed.

JP 2005-266147 A JP-A-10-204363 JP 2000-293108 A

  An object of the present invention is to make it possible to prevent a label attached to an article from being reused after the period of use of the article has ended.

  According to the first aspect of the present invention, an optical function layer that transmits light of a certain wavelength, a light absorption pattern layer that faces the optical function layer and absorbs light of the wavelength, and in front of the light absorption pattern layer There is provided a label comprising a light-transmitting layer that is positioned and transmits light of the wavelength, the light-transmitting layer including a foamable material that is foamed by heating.

  According to the second aspect of the present invention, the wavelength is in the near infrared region, the transmittance of the optical function layer at the wavelength is 30% or more, and the optical function layer is 700 to 800 nm in the near infrared region. There is provided a label according to the first aspect in which the transmittance difference of any wavelength is 10% or more in the wavelength region of 800 nm and 1500 nm in the near infrared region.

  According to a third aspect of the present invention, there is provided a label according to the first or second aspect, wherein the light absorption pattern layer and the optical functional layer are the same color.

According to a fourth aspect of the present invention, there is provided an adhesive label comprising a label according to any one of the first to third aspects and an adhesive layer facing the back surface of the label.

According to the fifth aspect of the present invention, the label according to any one of the first to third aspects, the printing substrate facing the back surface of the label, and the label and the printing substrate are interposed. Thus, a printed matter comprising an adhesive layer in which the label is attached to the printing substrate is provided.

  According to the present invention, it is possible to prevent a label attached to an article from being reused after the period of use of the article is completed.

  In the label according to the first aspect, when at least a part of the light transmissive layer is subjected to a process of foaming expandable particles by heating (hereinafter referred to as “invalidation process”), the wavelength of the light transmissive layer is determined at that position. The transmittance at (hereinafter referred to as “first wavelength”) becomes low. As a result, in this label, the light-absorbing pattern layer cannot be observed or difficult to observe due to the invalidation process. Therefore, by detecting this change with the naked eye and / or by machine reading, it is possible to determine the presence or absence of invalidation processing.

  The label which concerns on a 2nd side WHEREIN: The 1st wavelength is in a near-infrared area | region among the labels which concern on a 1st side surface, and the transmittance | permeability in the 1st wavelength of an optical function layer is 30% or more, The said optical function layer is The transmittance difference of any wavelength is 10% or more between the wavelength range of 700 to 800 nm in the near infrared region and the wavelength range of 800 to 1500 nm in the near infrared region. That is, the transmission spectrum in the near-infrared region of the optical functional layer shows a high transmittance at the first wavelength, and in the near-infrared region of 700 to 800 nm and in the near-infrared region of 800 to 1500 nm. The difference in transmittance at any wavelength is 10% or more. Therefore, it is impossible for a person who does not know to use light of the first wavelength for authenticity determination to determine the difference between the label before the invalidation process and the label after the invalidation process. Or difficult. Therefore, it is difficult for a person who performs fraud to realize that the counterfeit prevention measures using the invalidation process are taken.

  The label which concerns on a 3rd side is a thing with the same color of a light absorption pattern layer and an optical function layer among the labels which concern on the 1st or 2nd side. In this case, it is difficult to realize the existence of the light absorption pattern layer before performing the invalidation process. Therefore, if such a configuration is adopted, it becomes possible to suppress forgery of the label itself.

  The pressure-sensitive adhesive label according to the fourth side includes the label according to any one of the first to third side surfaces. The pressure-sensitive adhesive label is a form that can be used when the previous label is attached to an article.

  The printed material according to the fifth aspect includes a label according to any one of the first to third aspects. The printed material is less likely to be reused after the end of its use period.

The top view which shows the label which concerns on 1 aspect of this invention roughly. Sectional drawing along the II-II line of the label shown in FIG. The figure which shows schematically an example of the invalidation processing method of the label shown in FIG.1 and FIG.2. The top view which shows roughly an example of the label to which the invalidation process was performed. Sectional drawing along the VV line of the label shown in FIG. Sectional drawing which shows schematically the other modification of the label shown in FIG.1 and FIG.2. Sectional drawing which shows an example of an adhesive label roughly. The top view which shows an example of printed matter roughly. Sectional drawing along the IX-IX line of the printed matter shown in FIG. The graph which shows an example of the change of the spectral characteristics before and behind invalidation processing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same referential mark is attached | subjected to the component which exhibits the same or similar function, and the overlapping description is abbreviate | omitted. The “near-infrared region” here means a wavelength region of 700 nm to 1500 nm.

  FIG. 1 is a plan view schematically showing a label according to one embodiment of the present invention. 2 is a cross-sectional view taken along line II-II of the label shown in FIG.

  The label 1 shown in FIGS. 1 and 2 includes a base material 11, an optical functional layer 13, a light absorption pattern layer 14, and a light transmission layer 12. The optical function layer 13, the light absorption pattern layer 14, and the light transmission layer 12 are laminated on the substrate 11 in this order. In the label 1, the surface on the light transmission layer 12 side is the front surface, and the surface on the substrate 11 side is the back surface.

  The light transmission layer 12, the light absorption pattern layer 14, and the optical function layer 13 may be laminated on the base material 11 in this order. In this case, the surface of the label 1 on the substrate 11 side is the front surface, and the surface on the optical function layer 13 side is the back surface.

  The base material 11 is a film made of resin, for example. As this resin, for example, plastics such as polyethylene terephthalate, polyethylene naphthalate, polypropylene, polycarbonate, and polyethylene can be used. The substrate is typically transparent, but may be opaque such as an aluminum foil. However, when the surface on the base material 11 side of the label 1 is the front surface, the base material 11 that transmits light of the first wavelength, typically light of the first and second wavelengths different from each other is used. To do.

  The substrate 11 may have a single layer structure or a multilayer structure. As the substrate 11, it is preferable to use a substrate having a higher reflectance than the optical function layer 13 described later. The base material 11 can be omitted.

  The optical function layer 13 is provided on the substrate 11. The optical functional layer 13 transmits light having the first wavelength. The transmittance of the optical function layer 13 with respect to the light of the first wavelength is, for example, 30% or more, and is typically in the range of 30 to 60%.

  The optical function layer 13 may be colored. The optical functional layer 13 is typically a black layer. Here, “black” means that, when the intensity of specular reflection light is measured, the reflectance is 10% or less for all light components having a wavelength in the range of 400 nm to 700 nm. Yes.

When the first wavelength is in the near infrared region, the optical function layer 13 has a transmittance of 30% or more at the first wavelength, and the optical function layer has a wavelength range of 700 to 800 nm in the near infrared region. In addition, a material having a transmittance difference of any wavelength of 10% or more in the wavelength range of 800 to 1500 nm in the near infrared region may be used. That is, the optical functional layer 13 may have a transmission spectrum in the near-infrared region that exhibits high transmittance at the first wavelength and low transmittance at many other wavelengths. Here, as an example, it is assumed that the optical functional layer 13 has such optical characteristics. Here, the second wavelength is also in the near infrared region, and the transmittance of the optical function layer 13 at the second wavelength is lower than the transmittance of the optical function layer 13 at the first wavelength. The transmittance of the optical function layer 13 at the first wavelength is 80% or less.

  The optical functional layer 13 having the optical characteristics described above, that is, optical characteristics of selectively transmitting light in a part of the wavelength region out of light in the near infrared region and absorbing the remaining light, For example, a predetermined near infrared absorber and a resin are included. This near-infrared absorber absorbs the light of the said 2nd wavelength, for example. As this near-infrared absorber, for example, at least one selected from the group consisting of phthalocyanine compounds, naphthalocyanine compounds, anthraquinone compounds, diimonium compounds, and cyanine compounds can be used. Moreover, as resin, what is generally used in process ink can be used, for example.

  The optical function layer 13 is formed by, for example, a printing method. Examples of the printing method include an offset printing method, a gravure printing method, a screen printing method, and a flexographic printing method. The thickness of the optical functional layer 13 is, for example, in the range of 0.5 to 10 μm, and typically in the range of 2 to 5 μm.

  The light absorption pattern layer 14 is provided on the optical function layer 13. The light absorption pattern layer 14 faces a part of the light transmission layer 12 with the optical function layer 13 interposed therebetween. In the example shown in FIGS. 1 and 2, the light absorption pattern layer 14 constitutes a one-dimensional code. The light absorption pattern layer 14 may constitute a two-dimensional code. Or the light absorption pattern layer 14 may comprise other patterns, such as a character, a symbol, a pattern, and a figure.

  The light absorption pattern layer 14 absorbs light of the first wavelength. Specifically, the absorptance at the first wavelength of the light absorption pattern layer 14 is compared with the absorptance at the first wavelength of the light transmission layer 12 and the absorptance at the first wavelength of the optical function layer 13 immediately after the production of the label 1. And bigger. The absorption rate of the light absorption pattern layer 14 with respect to the light of the first wavelength is, for example, 50% or more, and typically 80% or more.

  When the first wavelength is in the near infrared region, the light absorption pattern layer 14 contains, for example, a near infrared absorber and a resin. As this resin, what is generally used in process ink can be used, for example.

  The near-infrared absorber used here typically has a different absorption spectrum in the near-infrared region from the near-infrared absorber used in the optical functional layer 13. For example, the near-infrared absorber used here has a higher absorptance with respect to light of the first wavelength than the near-infrared absorber used in the optical function layer 13. As this near-infrared absorbing agent, for example, carbon black used in process black ink can be used. Or you may use the compound illustrated as a near-infrared absorber of the optical function layer 13 as this near-infrared absorber.

  It is preferable that the light absorption pattern layer 14 has the same color as the optical function layer 13 or a light color as long as it exhibits a sufficient absorptance with respect to light of the first wavelength. This makes it difficult to understand the presence of the light absorption pattern layer 14 when the label 1 is observed with the naked eye.

  It is desirable that the light absorption pattern layer 14 is distributed over almost the entire region corresponding to the light transmission layer 12 described later. This can make it difficult to analyze the spectral characteristics of the optical functional layer 13.

  The light absorption pattern layer 14 is formed by, for example, a printing method. Examples of the printing method include an offset printing method, a gravure printing method, a screen printing method, and a flexographic printing method. Alternatively, the light absorption pattern layer 14 may be formed using a thermal transfer ribbon, an ink jet printing method, or a laser printing method. The thickness of the light absorption pattern layer 14 is, for example, in the range of 0.5 to 10 μm, and typically in the range of 0.5 to 2 μm.

  The light transmission layer 12 faces the optical function layer 13 with the light absorption pattern layer 14 interposed therebetween. That is, the light transmission layer 12 is positioned in front of the light absorption pattern layer 14.

  The light transmission layer 12 transmits light having the first wavelength. That is, the light transmission layer 12 transmits the light of the first wavelength at least during the period from the completion of the label 1 to the invalidation process.

  The light transmission layer 12 includes a foamable material that foams when heated. And this light transmission layer 12 is comprised so that the transmittance | permeability in a 1st wavelength may fall in the position where the said process was performed by performing the process which foams said foamable material. When the transmittance at the first wavelength of the light transmission layer 12 decreases, the optical effect due to the light absorption pattern layer 14 and the optical function layer 13 located behind the light transmission layer 12 becomes difficult to visually recognize or detect. By visually recognizing or detecting such a difference in optical effect, it is possible to determine the presence or absence of invalidation processing, and to determine the authenticity of the label 1 based on the determination.

  Immediately after the manufacture of the label 1, the transmittance T1 of the light transmission layer 12 with respect to the light of the first wavelength is in the range of 30 to 60%, for example, and after the invalidation process, the light transmission layer of the light with the first wavelength The transmittance T2 of 12 is in the range of 40 to 80%, for example. The ratio between the transmittance T2 and the transmittance T1 is, for example, in the range of 0.25 to 0.6, and typically in the range of 0.3 to 0.5.

  The light transmission layer 12 typically includes the expandable particles and a binder resin that holds them.

  The expandable particles include, for example, hollow particles including a thermoplastic plastic in an outer shell and a liquid gas included therein. The hollow particles are, for example, substantially spherical, and typically spherical. Examples of the thermoplastic plastic constituting the hollow particles include polystyrene, polyolefin, and polyvinyl chloride. Examples of the liquid gas include low boiling point hydrocarbons.

  When the expandable particles having the above configuration are heated, the liquid gas encapsulated in the hollow particles is vaporized. As a result, the internal pressure of the hollow particles increases and the thermoplastic plastic constituting the outer shell is softened. As a result, volume expansion of the expandable particles occurs. Typically, the light transmission layer 12 becomes cloudy with the volume expansion.

  A general thing can be used as binder resin. Examples of usable binder resins include acrylic resins, epoxy resins, ethylene-vinyl acetate copolymer resins, polyester resins, polyamide resins, polyurethane resins, and polyolefin resins.

  The light transmission layer 12 is formed by, for example, a coating method. This application can be performed using, for example, an air knife coater, a roll coater, a spray coater, a gravure coater, a micro gravure coater, or a bar coater. The film thickness of the light transmission layer 12 is, for example, in the range of 3 to 30 μm, and typically in the range of 5 to 10 μm.

  The authenticity determination of the label 1 described above is typically performed by machine reading. For example, this true / false determination can be performed using a sensor capable of detecting light in a specific wavelength range or a CCD (Charge Coupled Device) camera equipped with a bandpass filter that transmits light in a predetermined wavelength range. it can. Or the authenticity determination of the label 1 can also be performed visually. Alternatively, determination by machine reading and visual determination may be combined.

  When the label 1 shown in FIGS. 1 and 2 is illuminated with light of the first wavelength, this light passes through the light transmission layer 12. Therefore, in this case, the label 1 exhibits spectral characteristics peculiar to the light absorption pattern layer 14 and the optical function layer 13 when illuminated with light of the first wavelength. This spectral characteristic is specific to the specific configuration of the label 1. Therefore, the authenticity of the label 1 can be determined by measuring this spectral characteristic.

  In addition, the label 1 can be subjected to invalidation processing described below. By performing such processing, unauthorized reuse of the label 1 can be suppressed.

  FIG. 3 is a diagram schematically illustrating an example of the label invalidation processing method illustrated in FIGS. 1 and 2. FIG. 4 is a plan view schematically showing an example of a label subjected to invalidation processing. FIG. 5 is a cross-sectional view taken along line VV of the label shown in FIG.

  In the invalidation processing method shown in FIG. 3, the thermal head 41 is brought into contact with or scanned with respect to the label 1 to heat at least a part of the light scattering layer 12. Thereby, at least a part of the expandable particles included in the heated portion of the light transmission layer 12 is expanded.

  When this invalidation process is performed, the volume of the light transmission layer 12 expands at the position where the thermal head 41 contacts or scans the label 1, the light transmission layer 12 becomes cloudy, and the light transmission layer 12 at the first wavelength. The transmittance of is reduced. As a result, as shown in FIG. 5, in the light scattering layer 12, the first region 12 a in which the transmittance of the light transmission layer 12 at the first wavelength remains before the invalidation process, and the light transmission layer at the first wavelength. As a result, a second region 12b having a transmittance of 12 lower than that before the invalidation process is generated.

  In the portion corresponding to the second region 12b in the label 1, the transmittance of the light transmission layer 12 at the first wavelength is lowered, so that the optical effect based on the light absorption pattern layer 14 and the optical function layer 13 can be visually recognized or detected. Or it becomes more difficult to see or detect. That is, the spectral characteristics of the portion before and after the invalidation process are different from each other.

  As described above, when the invalidation process described above is performed, the transmittance of the light transmission layer 12 at the first wavelength is lowered, and typically the transmittance in the visible light region is also lowered. Therefore, typically, the optical effect of the label 1 changes both when the machine reading is performed at the first wavelength and when observed with the naked eye. More specifically, in the portion corresponding to the second region 12b of the label 1, the optical effect caused by the light absorption pattern layer 14 and the optical function layer 13 located behind the light transmission layer 12 is detected or visually recognized. It becomes difficult to do. Therefore, based on such a difference in optical effect, it can be determined whether or not the label 1 has been subjected to the above processing.

  Foaming in the light transmission layer 12 is an irreversible change. Therefore, it is impossible to return the label 1 once subjected to the invalidation process to the state before the process. Therefore, by performing the above-described processing on the label 1, it is possible to reliably prevent unauthorized reuse of the label 1.

  The authenticity determination of the label 1 may be performed using light having a plurality of wavelengths. For example, the authenticity determination of the label 1 may be performed using light having a first wavelength and light having a second wavelength different from the first wavelength. Alternatively, the authenticity determination of the label 1 may be performed using light of the first wavelength and light of two or more wavelengths different from the first wavelength. The number of wavelengths used for authenticity determination is, for example, in the range of 1 to 5, and preferably in the range of 2 to 5. If the number of wavelengths used for authenticity determination is too large, the time required for authenticity determination of label 1 may become excessively long.

The label 1 described above can be variously modified.
FIG. 6 is a cross-sectional view schematically showing a modification of the label shown in FIGS. The label 1 shown in FIG. 6 has the same configuration as the label described with reference to FIGS. 1 to 5 except that the stacking order of the light absorption pattern layer 14 and the optical function layer 13 is reversed. Have.

  The label 1 shown in FIG. 6 also exhibits different spectral characteristics before and after the invalidation process described above, for example, when illuminated with light of the first wavelength. Therefore, for example, true / false determination can be performed by detecting the difference in spectral characteristics.

Next, the adhesive label and printed matter including the label 1 described above will be described.
FIG. 7 is a cross-sectional view schematically showing an example of an adhesive label.
The adhesive label 10 shown in FIG. 7 includes the label 1 described with reference to FIGS. 1 and 2 and the adhesive layer 2. The adhesive layer 2 is provided on the back surface of the label 1.

  For example, the adhesive label 10 is affixed to an article that can be confirmed to be genuine. The pressure-sensitive adhesive label 10 may further include release paper that covers the surface of the pressure-sensitive adhesive layer 2 so as to be peelable.

  FIG. 8 is a plan view schematically showing an example of a printed material. FIG. 9 is a cross-sectional view taken along line IX-IX of the printed matter shown in FIG.

  The printed matter 100 shown in FIGS. 8 and 9 includes the label 1 described with reference to FIGS. 1 and 2, the adhesive layer 2, and the printed matter main body 3.

  The printed material body 3 includes a printing substrate 3a and a printing layer 3b. The label 1 is affixed to the printing substrate 3a through the adhesive layer 2.

  The printing substrate 3a is made of, for example, paper, plastic, wood, glass, or resin. The printing substrate 3a may have a single layer structure or a multilayer structure. The printing substrate 3a may have a layer shape or may have another shape.

  The printing layer 3b is provided on the printing substrate 3a. The printing layer 3b may cover the entire printing substrate 3a, or may cover only a part thereof.

  The printed material 100 is subjected to the invalidation process after the use period ends. In this way, it is possible to determine whether or not the label 1 has been reused for a printed matter whose authenticity is unknown. That is, it is possible to determine the authenticity of a printed matter whose authenticity is unknown. Accordingly, it is possible to check a person who performs an illegal act, and therefore, it is possible to prevent the label attached to the article from being reused after the use period of the article is ended. As a result, forgery of the printed material 100 can be suppressed.

  Examples of the present invention will be described below.

<Example 1>
The label 1 described with reference to FIGS. 1 and 2 was manufactured by the following method.

  First, a white polyethylene terephthalate (PET) sheet was prepared as the substrate 11. Next, an ink A having the composition shown below was applied to a part of one main surface of the substrate 11 by an offset printing method. Further, the coating film was irradiated with ultraviolet rays. In this way, the optical functional layer 13 was formed.

  On the optical function layer 13, ink B having the composition shown below was printed in a one-dimensional code using an offset printing method. Thus, the light absorption pattern layer 14 was formed.

  Next, an ink C having the composition shown below was applied onto the light absorption pattern layer 14 by a screen printing method, and was naturally dried. Thus, the light transmission layer 12 was formed, and the label 1 was completed. Hereinafter, this label is referred to as “label A1”.

  Separately from this, the label 1 was produced in the same manner as described above except that the ink C was applied and then heat-dried at 150 ° C. for 10 seconds. This label 1 was provided with a light transmission layer 12 in a state where foamable particles were foamed. That is, the label 1 has a configuration corresponding to the state after the invalidation process. Hereinafter, this label is referred to as “label B1”.

[Composition of ink A]
Organic blue pigment (manufactured by Gokoku Color Co., Ltd.) 5 parts by weight Organic red pigment (made by Gokoku Color Co., Ltd.) 7 parts by weight Organic yellow pigment (manufactured by Gokoku Color Co., Ltd.) 8 parts by weight UV curable offset ink medium (FD Carton ACE Medium) B: Toyo Ink Manufacturing Co., Ltd.) 80 parts by mass [Composition of ink B]
FD Carton ACE Sumiro (Toyo Ink Manufacturing Co., Ltd.)
[Composition of ink C]
Acrylic resin: Joncrill (manufactured by BASF) 100 parts by mass Expandable particles: EXPANCEL (manufactured by Nippon Philite Co., Ltd.) 10 parts by mass Spectral characteristics were measured. The result is shown in FIG.

  FIG. 10 is a graph illustrating an example of a change in spectral characteristics before and after the invalidation process. As can be seen from FIG. 10, in both the visible light region and the near-infrared region, the label B1 has a higher reflectance than the label A1.

  Further, the one-dimensional code formed by the light absorption pattern layer 14 was read with the label A1 and the label B1. As a result, the label A1 was able to read the one-dimensional code accurately both in the observation with the naked eye and the detection with the machine. On the other hand, in the label B1, the one-dimensional code cannot be accurately read in both of them.

<Example 2>
Labels A2 and B2 were produced in the same manner as in Example 1 except that instead of the ink A, the ink D having the composition shown below was used as the material of the optical functional layer 13. The label A2 corresponds to the label 1 before invalidation processing, and the label B2 corresponds to the label 1 after invalidation processing. The following ink D contains an infrared absorber that absorbs light of the second wavelength.

[Composition of ink D]
Organic blue pigment (manufactured by Gokoku Color Co., Ltd.) 5 parts by weight Organic red pigment (made by Gokoku Color Co., Ltd.) 7 parts by weight Organic yellow pigment (made by Gokoku Color Co., Ltd.) 8 parts by weight Infrared absorber (YKR-3081: Yamamoto Kasei Co., Ltd.) 5 parts by mass Medium for UV curable offset ink (FD Carton ACE Medium B: manufactured by Toyo Ink Co., Ltd.) 75 parts by mass Each of the labels A2 and B2 thus obtained was subjected to a machine reading test. . As a result, in the label A2, when the light of the first wavelength was used, the barcode by the light absorption pattern layer 14 could be read. However, when the light of the second wavelength was used, the barcode could not be read because the contrast between the light absorption pattern layer 14 and the optical function layer 13 was lowered. On the other hand, in the label B2, barcodes could not be read for both the first wavelength and the second wavelength.
The invention described in the original claims is appended below.
[1]
An optical function layer that transmits light of a certain wavelength, a light absorption pattern layer that faces the optical function layer and absorbs light of the wavelength, and is positioned in front of the light absorption pattern layer and transmits light of the wavelength A label comprising: a light transmissive layer that includes a light transmissive layer containing a foamable material that foams when heated.
[2]
The wavelength is in the near infrared region, the transmittance of the optical function layer at the wavelength is 30% or more, and the optical function layer has a wavelength region of 700 to 800 nm in the near infrared region, and a near infrared region. The label according to [1], wherein a transmittance difference of any wavelength is 10% or more in a wavelength range of 800 to 1500 nm.
[3]
The label according to [1] or [2], wherein the light absorption pattern layer and the optical function layer have the same color.
[4]
[1] An adhesive label comprising the label according to any one of [3] and an adhesive layer facing the main surface of the label on the light-absorbing pattern layer side.
[5]
The label according to any one of [1] to [3];
A printing substrate facing the main surface of the label on the light absorption pattern layer side;
An adhesive layer interposed between the label and the printing substrate, and the label attached to the printing substrate;
Printed matter comprising

  DESCRIPTION OF SYMBOLS 1 ... Label, 2 ... Adhesive layer, 3 ... Printed material main body, 3a ... Printing base material, 3b ... Printing layer, 10 ... Adhesive label, 11 ... Base material, 12 ... Light transmission layer, 12a ... 1st area | region, 12b ... 1st 2 regions, 13 ... optical functional layer, 14 ... light absorption pattern layer, 41 ... thermal head, 100 ... printed matter.

Claims (5)

  An optical function layer that transmits light of a certain wavelength, a light absorption pattern layer that faces the optical function layer and absorbs light of the wavelength, and is positioned in front of the light absorption pattern layer and transmits light of the wavelength A label comprising: a light transmissive layer that includes a light transmissive layer containing a foamable material that foams when heated.   The wavelength is in the near infrared region, the transmittance of the optical function layer at the wavelength is 30% or more, and the optical function layer has a wavelength region of 700 to 800 nm in the near infrared region, and a near infrared region. The label according to claim 1, wherein the transmittance difference of any wavelength is 10% or more in a wavelength range of 800 to 1500 nm.   The label according to claim 1 or 2, wherein the light absorption pattern layer and the optical function layer have the same color. A pressure-sensitive adhesive label comprising the label according to claim 1 and a pressure-sensitive adhesive layer facing the back surface of the label. A label according to any one of claims 1 to 3,
A printing substrate facing the back of the label;
A printed matter comprising an adhesive layer interposed between the label and the printing substrate and having the label attached to the printing substrate.

Images